1.

The angles of a triangle are in the ratio 1:4:5 find the second angle​

Answer»

72° Step-by-step EXPLANATION:Let the RATIO be x : 4X : 5x.According to the angle sum PROPERTY of triangle, the sum of all angles of a triangle is 180°.=> x + 4x + 5x = 180°=> 10X = 180°=> x = 180/10=> x = 18°Hence, second angle = 4×18° = 72°



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